Question

which statement best explains the higher car in the soil of wetland ecosystems compared with forest ecosystems? hide all a forest ecosystems are larger, so there are more plants to absorb carbon from the atmosphere. b forest ecosystems undergo more anaerobic respiration, which moves more carbon into the atmosphere. c wetland ecosystems are smaller, so the excess carbon produced moves into the soil. d wetland ecosystems undergo more anaerobic respiration, which moves more carbon into the soil.

Explanation:

To determine the correct answer, we analyze each option:

• Option A: Forest size and plant carbon absorption don't explain wetland soil's higher CAR. Eliminate A.
• Option B: Forests have more aerobic (not anaerobic) respiration, and this would reduce soil carbon, not explain wetland's higher CAR. Eliminate B.
• Option C: Ecosystem size doesn't directly relate to carbon moving to soil. Eliminate C.
• Option D: Wetlands are water - logged, so they have more anaerobic respiration. Anaerobic respiration in wetlands leads to more carbon being stored in the soil (e.g., as organic matter), which explains the higher CAR in wetland soil.

Answer:

D. Wetland ecosystems undergo more anaerobic respiration, which moves more carbon into the soil.